- By Emmanuel Valverde
- ·
- Posted Mar 5, 2024 12:05:53 PM
Morning Routine
As a forgetful person, I need to remember my morning routine. Because of this, I have created a program that, depending on the time of day, will tell..
What do we want to build?
We are building a shopping cart for an online grocery shop. The idea of this kata is to build the product in an iterative way.
Technical requirements
- The price per unit is calculated based on the product cost and the percentage of revenue that the company wants for that product.
- The price has to be rounded up; so if a price per unit calculated is 1.7825, then the expected price per unit for that product is 1.79
- The final price of the product is then calculated as the price per unit with the VAT rounded up.
- Products are not allowed to have the same name.
List of products
| Name | Cost | % Revenue | Price per unit | Tax | Final price |
| Iceberg 🥬 | 1.55 € | 15 % | 1,79 € | Normal (21%) | 2.17 € |
| Tomato 🍅 | 0.52 € | 15 % | 0.60 € | Normal (21%) | 0.73 € |
| Chicken 🍗 | 1.34 € | 12 % | 1.51 € | Normal (21%) | 1.83 € |
| Bread 🍞 | 0.71 € | 12 % | 0.80 € | First necessity (10%) | 0.88 € |
| Corn 🌽 | 1.21 € | 12 % | 1.36 € | First necessity (10%) | 1.50 € |
List of discounts
| Discounts code | Amount |
|---|---|
| PROMO_5 | 5% |
| PROMO_10 | 10% |
Use cases
List the shopping cart
As customer
I want to see my shipping cart
Empty cart
--------------------------------------------
| Product name | Price with VAT | Quantity |
| ----------- | -------------- | -------- |
|------------------------------------------|
| Promotion: |
--------------------------------------------
| Total productos: 0 |
| Total price: 0.00 € |
--------------------------------------------
Add product to shopping cart
As customer
I want to add Iceberg 🥬 to my shipping cart
I want to add Tomatoe 🍅 to my shipping cart
I want to add Chicken 🍗 to my shipping cart
I want to add Bread 🍞 to my shipping cart
I want to add Corn 🌽 to my shipping cart
I want to see my shipping cart
--------------------------------------------
| Product name | Price with VAT | Quantity |
| ----------- | -------------- | -------- |
| Iceberg 🥬 | 2.17 € | 1 |
| Tomatoe 🍅 | 0.73 € | 1 |
| Chicken 🍗 | 1.83 € | 1 |
| Bread 🍞 | 0.88 € | 1 |
| Corn 🌽 | 1.50 € | 1 |
|------------------------------------------|
| Promotion: |
--------------------------------------------
| Total productos: 5 |
| Total price: 7.11 € |
--------------------------------------------Add product to shopping cart
As customer
I want to add Iceberg 🥬 to my shipping cart
I want to add Iceberg 🥬 to my shipping cart
I want to add Iceberg 🥬 to my shipping cart
I want to add Tomatoe 🍅 to my shipping cart
I want to add Chicken 🍗 to my shipping cart
I want to add Bread 🍞 to my shipping cart
I want to add Bread 🍞 to my shipping cart
I want to add Corn 🌽 to my shipping cart
I want to see my shipping cart
--------------------------------------------
| Product name | Price with VAT | Quantity |
| ----------- | -------------- | -------- |
| Iceberg 🥬 | 2.17 € | 3 |
| Tomatoe 🍅 | 0.73 € | 1 |
| Chicken 🍗 | 1.83 € | 1 |
| Bread 🍞 | 0.88 € | 2 |
| Corn 🌽 | 1.50 € | 1 |
|------------------------------------------|
| Promotion: |
--------------------------------------------
| Total productos: 8 |
| Total price: 12.33 € |
--------------------------------------------
Apply discount to the shopping cart
As customer
I want to add Iceberg 🥬 to my shipping cart
I want to add Iceberg 🥬 to my shipping cart
I want to add Iceberg 🥬 to my shipping cart
I want to add Tomatoe 🍅 to my shipping cart
I want to add Chicken 🍗 to my shipping cart
I want to add Bread 🍞 to my shipping cart
I want to add Bread 🍞 to my shipping cart
I want to add Corn 🌽 to my shipping cart
I want to apply my coupon code PROMO_5
I want to see my shipping cart
--------------------------------------------
| Product name | Price with VAT | Quantity |
| ----------- | -------------- | -------- |
| Iceberg 🥬 | 2.17 € | 3 |
| Tomatoe 🍅 | 0.73 € | 1 |
| Chicken 🍗 | 1.83 € | 1 |
| Bread 🍞 | 0.88 € | 2 |
| Corn 🌽 | 1.50 € | 1 |
|------------------------------------------|
| Promotion: 5% off with code PROMO_5 |
--------------------------------------------
| Total productos: 8 |
| Total price: 11.71 € |
--------------------------------------------Possible API for the ShoppingCart
You could change this API this is only for example purposes.
Approach 1 passing objects as arguments could be DTO
public interface ShoppingCart {
public void addItem(Product product);
public void deletItem(Product product);
public void applyDiscount(Discount discount)
public void printShoppingCart();
}
Approach 2 passing primitives as arguments
public interface ShoppingCart {
public void addItem(String productName);
public void deletItem(String productName);
public void applyDiscount(Double discount)
public void printShoppingCart();
}
Approach 3 passing primitives as arguments and returning a DTO
public interface ShoppingCart {
public void addItem(String productName);
public void deletItem(String productName);
public void applyDiscount(Double discount)
public ShoppingCartList getShoppingCart();
}
Disclaimer
The graphic examples that you see on the kata are not there to be implemented if you don't want to, are there as a reference of how the kata works
